Bregne Ice Cap East Greenland Holocene Paleolimnology Data Levy, L.B.; Kelly, M.A.; Lowell, T.V.; Hall, B.L.; Hempel, L.A.; Honsaker, W.; Lusas, A.R.; Howley, J.A.; Axford, Y. Levy, L.B. Kelly, M.A. Lowell, T.V. Hall, B.L. Hempel, L.A. Honsaker, W. Lusas, A.R. Howley, J.A. Axford, Y. earth science/paleoclimate/paleolimnology (inorganic carbon,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (silt,sediment,null,percent,null,paleolimnology,null,null,N,grainsize fraction 2-4um) earth science/paleoclimate/paleolimnology (silt,sediment,null,percent,null,paleolimnology,null,null,N,grainsize fraction 4-20um) earth science/paleoclimate/paleolimnology (volume magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleolimnology,null,null,N,x10-5 units) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (clay,sediment,null,percent,null,paleolimnology,null,null,N,grainsize fraction <2um) earth science/paleoclimate/paleolimnology (sample identification,null,null,null,null,paleolimnology,null,null,C,null) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,depth in section) earth science/paleoclimate/paleolimnology (biogenic silica,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (organic matter,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (sand,sediment,null,percent,null,paleolimnology,null,null,N,grainsize fraction 50-250um) earth science/paleoclimate/paleolimnology (silt,sediment,null,percent,null,paleolimnology,null,null,N,grainsize fraction 20-50um) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Last Chance Lake>LATITUDE 70.909>LONGITUDE -25.585) (Bregne Ice Cap>LATITUDE 70.907>LONGITUDE -25.595) (Two Move Lake>LATITUDE 70.907>LONGITUDE -25.591) The Greenland Ice Sheet is a major component of the Arctic cryosphere and the magnitude of its response to future climate changes remains uncertain. Longer-term records of climate near the ice sheet margin provide information about natural climate variability and can be used to understand the causes of past changes in the Greenland Ice Sheet. As a proxy for Holocene climate near the ice sheet margin, we reconstruct the fluctuations of Bregne ice cap in the Scoresby Sund region of central east Greenland. Bregne is a small ice cap (2.5 km2 in area) and responds sensitively to summer temperatures. We employ a multi-proxy approach to reconstruct the ice cap fluctuations using geomorphic mapping, 10Be ages of boulders and bedrock and lake sediment records. Past extents of Bregne ice cap are marked by moraines and registered by sediments in downvalley lakes. 10Be ages of bedrock and boulders outboard of the moraines indicate that Bregne ice cap was within ~250 m of its present-day limit by at least 10.7 ka. Multi-proxy data from sediments in Two Move lake, located downvalley from Bregne ice cap, indicate that the ice cap likely completely disappeared during early and middle Holocene time. Increasing magnetic susceptibility and percent clastic material from ~6.5 to ~1.9 cal ka BP in Two Move lake sediments suggest progressively colder conditions and increased snow accumulation on the highlands west of the lake. Laminated silt deposited at ~2.6 cal ka BP and ~1.9 cal ka BP to present registers the onset and persistence of Bregne ice cap during the late Holocene. 10Be ages of boulders on an unweathered, unvegetated moraine in the Bregne ice cap forefield range from 0.74 to 9.60 ka. The youngest 10Be age (0.74 ka) likely represents the age of the moraine whereas older ages may be due to 10Be inherited from prior periods of exposure. This late Holocene moraine marks the second largest advance of the ice cap since deglaciation of the region at the end of the last ice age. The oldest moraine in the forefield dates to <=2.6 cal ka BP. The fluctuations of Bregne ice cap were likely influenced by Northern Hemisphere summer insolation throughout the Holocene and abrupt late Holocene cold events. STUDY NOTES: Lake sediment analyses (MS, LOI, grainsize, 14C dating, Biogenic silica) from lakes near Bregne ice cap, Scoresby Sund, eastern Greenland. Also included are 10Be ages from boulders on the historical moraines and boulders and bedrock just distal to the historical moraines. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Levy, L.B. Investigator : Kelly, M.A. Investigator : Lowell, T.V. Investigator : Hall, B.L. Investigator : Hempel, L.A. Investigator : Honsaker, W. Investigator : Lusas, A.R. Investigator : Howley, J.A. Investigator : Axford, Y. 2014-01-17 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/16014 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/bregne2014-10be.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/last-chance2014organic.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/last-chance2014biosi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/last-chance2014ms.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/two-move2014ms.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/two-move2014composition.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/bregne2014-10be.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/last-chance2014organic.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/last-chance2014biosi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/last-chance2014ms.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/two-move2014ms.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/two-move2014composition.txt English https://www.ncdc.noaa.gov/paleo/study/16014 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/bregne2014-10be.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/last-chance2014organic.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/last-chance2014biosi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/last-chance2014ms.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/two-move2014ms.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/two-move2014composition.txt Laura B. Levy, Meredith A. Kelly, Thomas V. Lowell, Brenda L. Hall, Laura A. Hempel, William M. Honsaker, Amanda R. Lusas, Jennifer A. Howley, Yarrow L. Axford2014Holocene fluctuations of Bregne ice cap, Scoresby Sund, east Greenland: a proxy for climate along the Greenland Ice Sheet marginQuaternary Science Reviews10.1016/j.quascirev.2013.06.024http://www.sciencedirect.com/science/article/pii/S0277379113002448 START YEAR: 12000 cal yr BP * END YEAR: 0 cal yr BP -25.595 70.907 -25.585 70.909